here are some of the the visible changes.
Internally I rewrote almost the complete plugin
A lot of other bug fixes are not described in detail in the
history, there were too much :-[
(to support in the very next revision something like
personal highlighters and additional special keywords etc.).
Note: Version 0.5.6 was an internal release only.
URL: http://liveordead.de/free/hpg_ed_057.zip
(Please help me to find bugs! If the release is almost bug free I will
send them to CG for his Addons section again

V 0.5.7:
Changes:
- add: Added MRU of the last 10 documents loaded with
hpg_ed
- add: Added MS Visual Studio like Bookmarks,
CTRL-F2 Set/Unsets a bookmark
F2 jumps to the next bookmark regardingless of the
bookmark's number
- add: Bookmarks can be Set/Unset by simply clicking on the
Gutter with the left mouse button.
- add: Added option 'Hide gutter'. If line numbers are switched
off, the gutter (and of course the bookmark indicators!) can be
hided.
V 0.5.6:
Changes:
- fix: Toolbar buttons do not reflect the real states for cut, copy,
paste
- enh: Removed the configuration from main application and
moved it to the new hpg_ed_cfg.dll. So the code is smaller and
the plugin loads faster into memory.
- add: Support now unix (linux) text files. hpg_ed detects now
whether a file is either ANSI(PC) oder UNIX (linux) style and
saves the file in the detected format.
(Also added an indicator in main window, that displays unix in
case of unix files).
- fix: Cursor Beyond EOF did not work, instead the SmartTabs
value was used, which lead to strange effects :-[.
- enh: Colour can be either one of the 16 palette entries or any
custom color selectable with a standard color dialog.
Have Fun!